<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <base target="_blank">
    <title>Title</title>
</head>
<body>
    <ul>
        <li>
            <a href="/ueditor.html">ueditor</a>
        </li>
    </ul>
</body>
</html>

<style>
    html, body {
        height: 100%;
        margin: 0px;
        padding: 0px;
    }

    body {
        box-sizing: border-box;
        display: flex;
        justify-content: center;
        align-items: center;
        padding-bottom: 20%;
    }
</style>